Thank you, matsickma!!
If I'm not mistaken,for M75s: 98 & some 99: DeArmond horizontal inscription,with a curly D and pointed A,plain TRC w/ Guild +the big G+m75, curly D knobs.
After that: slanted Dearmond inscription,'interruptus" D and rounded A, gold shield TRC w/ by Guild,NO big G+m75,interruptus D knobs (sometimes!).
Closest font I spotted to replicate the curly D is Kaufmann std Bold,so I might get me some gold confetti,paste the goddam Ds on, and FLOOD THE MARKET with thousands of fake-D knobs that will leave all the experts speechless ,get real rich,and then I'll ride , like a cowboy,into the dawn to Montana!!Yippie-tay-eh-ho-tayyee-heyyyy!(Gonna be a Dearmond-knobs tycoon!!)